CN1479536A - Method and device dfor realizing synchronization of interface business between base stution controller and base stations in radio commumnication system - Google Patents
Method and device dfor realizing synchronization of interface business between base stution controller and base stations in radio commumnication system Download PDFInfo
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Abstract
The method includes following steps. (1) RNC obtaining parameters of time delay and time delay jitter of at least one services at Iub interface; (2) calculating time window of service; (3) creating transmission channel, selecting time window parameter for configuring transmission channel; (4) based on sending time point of download data frame, RNC sends download service frames. The invented equipment includes the device for determining time window, the device for selecting time window parameter for configuring transmission channel, the device for determining time point to sent and sending device. The invention simplifies process for synchronizing Iub interface, and simplifies functional design of RNC and Node B FP as well as raises stability for transferring data frame at Iub interface.
Description
Technical field
Field of the present invention relates to wireless communication technology, be specifically related to relate to Iub (interface between base station controller and the base station) the interface transport channel synchronization technology in the 3-G (Generation Three mobile communication system), more specifically relate to the synchronous method and apparatus of Iub interface business realizing in the wireless communication system.
Background of invention
Iub interface is the RNC (radio network controller, i.e. base station controller) of 3GPP (3rd Generation Partnership Project, 3G (Third Generation) Moblie cooperative programme) definition and the standard interface of Node B (Node B) equipment.The transmission bearer of all kinds of business data frame on Iub interface is referred to as transmission channel.Since in RNC and the Node B equipment and equipment room have different clock sources, so the processing of the Frame on the transmission channel and transmission are not that nature is synchronous.
But the synchronous of transmission channel is again that the Iub interface Business Processing necessarily requires.This is main because following key element:
1. prevent that Frame from arriving the baseband processing unit of Node B equipment too early.The Frame aloft processing of interface carried out in strict accordance with the specific timing time.If Frame arrives NodeB equipment too early, just can only advanced row cache.But the memory capacity of any equipment all is limited, and the too early arrival of mass data frame will be exerted heavy pressures on to the buffer memory of Node B;
2. prevent that Frame from crossing the baseband processing unit of late arrival Node B equipment.Same because the Frame processing of interface was aloft carried out in strict accordance with the specific timing time, therefore, the information of each the frame transport channel data frame aloft delivery time of interface all is strict the setting.Before the transmission, also must reserve enough processing times to baseband processing unit.If Frame is crossed late arrival NodeB equipment, can't handle, cause frame losing.
3. Business Processing is to the requirement of propagation delay time.No matter real time business or non-real-time service all have it accordingly to the reasonable request of propagation delay time in its Frame processing procedure.Real time business (as voice service) Frame is handled strict end-to-end time delay restriction especially.That is to say that even do not consider the problems such as buffer memory of Node B, Frame is in transmission time of Iub interface and neither be unlimited at the cache-time of Node B.
In sum, the realization of Iub interface transport channel synchronization can be summed up as 2 points:
1. for the Frame of each transmission channel rational time of reception window is set at Node B.
2. for the Frame of each transmission channel rational delivery time is set at RNC;
For realizing transport channel synchronization, the general processing method of a cover has been described in the present Iub FP agreement.Fig. 1 has described the flow chart of the processing method in the existing Iub FP agreement, and this processing method comprises the steps:
1. on certain bar transmission bearer, carry out node (NODE SYNCHRONISATION) synchronously.Method is: 1) RNC FP sends descendant node synchronous control frame (DL NODESYNCHRONISATION), and the time point T1 that RNC sends this frame is set in frame.2) after Node B FP receives the descendant node synchronous control frame, return the upstream node synchronous control frame to RNC.In frame, return the T1 that identifies in the descendant node synchronous control frame, write the time T 2 that Node B FP receives the descendant node synchronous control frame simultaneously, and Node B FP returns the time T 3 of upstream node synchronous control frame.3) after RNC FP receives the upstream node synchronous control frame, extract T1, T2 and T3, recorder simultaneously is to the time T 4 of upstream node synchronous control frame.
Synchronous by node, RNC can record up-downgoing propagation delay time, round-trip delay (the Round Trip Delay between phase difference, RNC and the Node B between the counter (BFN) of the counter (RFN) of RNC and Node B, RTD), calculate an initial deviation comparatively accurately for transport channel synchronization between RNC and the Node B.
2. set up transmission channel according to the customer service needs, and transmission channel is provided with the time of reception window of Node B FP.
Method is: dispose associated transport channel parameter---ToAWS (Time Of Arrival Window Startpoint by NBAP message to Node B FP, the time window starting point) and ToAWE (Time OfArrival Window Endpoint, time window end point), the value of TOAWS and TOAWE can be determined the starting point and the last point of time of reception window.ToAWS represents the reasonable time of reception scope of Node B FP for each frame data; ToAWE represents that time of reception point is later, but still carries out a time range of Base-Band Processing if having time.
By the setting of time window parameter, determined an initial range of Node B FP receiving data frames.
3.RNC carry out transport channel synchronization in the carrying at transmission channel before sending downlink data frame.
Method is: 1) RNC FP sends descending transmission channel synchronous control frame (DL SYNCHRONISATION) on corresponding transmission channel.2) Node B FP comprises the uplink transport channel synchronous control frame (UL SYNCHRONISATION) of arrival time point (ToA) parameter to the RNC transmission according to the position of time of reception point and time window after receiving this frame.3) after RNC FP receives the uplink transport channel synchronous control frame, adjust the transmitting time point, continue to send the descending transmission channel synchronous control frame, till the time point of indicating in the uplink transport channel synchronous control frame that NodeB returns indicated that frame that Node B received just now drops in the time window, thought that this transmission channel has obtained synchronously this moment.
By transport channel synchronization, RNC has determined the transmitting time point of transport channel data frame.
4. the calibration in the downlink service data frame transmission course.
Method is: having under the situation of Frame, RNC FP sends downlink data frame to Node B FP, Node B FP record data frame time of advent, and determine according to the comparative result of the time of advent and TOAWS and TOAWE whether this frame is suitable the time of advent.If arrive outside time window, Node B FP returns the timing alignment control frame (TIMING ADJUSTMENT) that has TOA and gives RNC FP.Especially, if Frame is later than time window end point ToAWE the time of advent, then Node B FP will abandon this frame.
By this alignment mechanism in the downlink service data frame transmission course, RNC FP can adjust data transmitting time point and time of reception window size, finally reaches stable, realizes transport channel synchronization.
Though the general scheme that present Iub FP agreement provides a cover initial setting up, dynamically adjusted wishes to obtain transport channel synchronization with this.But, because this design for scheme does not combine with the transmission of RAN system data and the treatment characteristic of reality, do not consider the restriction in the actual operation yet, therefore, there is many disadvantages in actual implementation procedure.In a word, there are three big shortcomings in this scheme:
1.FP the span of the permission of time window parameter is a very big scope in the agreement, the initial setting up of this parameter is extremely unreasonable probably.And the unreasonable compensator or trimmer pressure that will cause Node B of the value of time window parameter is excessive or business data frame drops on outside the time window continually, causes admission control;
2. the method need be carried out transport channel synchronization repeatedly at the beginning of transmission channel is set up, and just can find a suitable data transmitting time point, makes the user elongated turn-on time;
3. initial transport channel synchronization does not show that later business data frame can still drop in the time window, still may need the transmitting time point of frequent adjustment data even need complicated algorithm to support dynamically updating and disposing of time window parameter after beginning to carry out professional the transmission.
In a word, the method will cause transport channel synchronization algorithm complexity, and Iub interface additional transmissions expense increases, and the frame loss rate of service surface increases, bad stability, and service feature descends.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of method that in communication system, realizes the Iub interface transport channel synchronization of at least a business, comprise step:
RNC obtains the time delay and the jitter parameter at Node B side Iub interface of described at least a business;
According to the time delay and the jitter parameter of described acquisition, calculate the time window of described business and calculate RNC transmitting time point;
Set up transmission channel, for transmission channel is selected window parameter setup time;
According to the transmitting time point of downlink data frame, RNC sends the downlink business frame.
What alternatively, described RNC obtained described at least a business comprises step in the time delay of Node B side and the step of jitter parameter: obtain processing delay jitter parameter, intrinsic time delay, processing time Tproc parameter.
Preferably, comprise step: the OM of described Node B reports RNC with the processing delay and the jitter parameter empirical value of Node B side by the OM passage; The OM of Node B reports RNC with intrinsic time delay, the processing time Tproc of Node B side by the OM passage.
Alternatively, the step of the time window of the described business of wherein said calculating also comprises step:
Determine the maximum jitter Trj of described business in Iub interface RNC side;
Determine that described business is at Iub interface Node B side maximum jitter Tnb_tj;
The maximum that Node B place causes that is sent in advance of determining RNC cushions Tbuf_ra in advance;
Determine described business delay variation Tr_isj in the business of Iub interface RNC side;
Determine described business delay variation Tnb_isj in the business of Iub interface Node B side;
Determine the value of calculation deviation To;
Obtain professional time window size ToAWS according to following formula,
ToAWS＝Trj+Tnb_tj+To+Tr_isj+Tnb_isj+Tbuf_ra。
Preferably, wherein,
Described business is the poor of the maximum delay that experienced in Iub interface RNC side of single cell data frame of described business and minimal time delay at the maximum jitter Trj of Iub interface RNC side; And/or
Described business is the poor of the maximum delay that experienced in Iub interface Node B side of single cell data frame of described business and minimal time delay at Iub interface Node B side maximum jitter Tnb_tj; And/or
Described business delay variation Tr_isj in Iub interface RNC side professional maximum delay that to be the maximum delay that experienced in Iub interface RNC side of the Frame of the maximum of described business and minimum data frame experienced in Iub interface RNC side poor; And/or
Described business delay variation Tnb_isj in Iub interface Node B side professional maximum delay that to be the maximum delay that experienced in Iub interface Node B side of the Frame of the maximum of described business and minimum data frame experienced in Iub interface Node B side poor; And/or
The value of described calculation deviation To is to determine by the error of calculation delay and jitter parameter.
Alternatively, wherein, RNC and NodeB are carried out synchronous step comprise: it is synchronous that RNC and NodeB carry out node, so that RNC obtains up-downgoing propagation delay time, round-trip delay between phase difference, RNC and the Node B between RFN and the BFN.
Preferably, also comprise step:
For the transmission channel of described foundation is selected window parameter setup time;
RNC selects suitable time window parameter, transmission channel is carried out the configuration of time window parameter according to the type of service of setting up that transmission channel transmitted.
Alternatively, method also comprises step: the downlink data frame transmitting time point of determining RNC.
Preferably, wherein, the step of described definite time point is finished through the following steps: after receiving downlink data frame, determine the transmitting time point of downlink data frame according to the processing time Tproc of the maximum delay shake Tmj of the intrinsic time delay Ti of the skyborne transmitting time point of these frame data, Iub interface, Iub interface and Node B.
Alternatively, wherein, the intrinsic time delay Ti of described Iub interface comprises the intrinsic time delay and the intrinsic time delay of Node B side of RNC side;
Described business is the fixed delay of this business minimum data frame correspondence in the intrinsic time delay of Iub interface RNC side;
Described business is the fixed delay of this business minimum data frame correspondence in the intrinsic time delay of Iub interface Node B side.
The present invention also provides a kind of device of realizing the Iub interface transport channel synchronization of at least a business in communication system, comprising:
Obtain the device of time delay and jitter parameter, be used to obtain the time delay and the jitter parameter at Node B side Iub interface of described at least a business;
Time window and RNC transmitting time point are determined device, are used for time delay and jitter parameter according to described acquisition, calculate the time window of described business and calculate RNC transmitting time point;
Set up transmission channel, for transmission channel is selected window parameter devices setup time;
Dispensing device is used for sending the downlink business frame according to the transmitting time point of downlink data frame.
Method and apparatus of the present invention has overcome the shortcoming of prior art, saved transmission channel set up at the beginning of the long synchronizing process of Iub interface.Not only simplified the function design of RNC and Node B FP, the more important thing is, for user's access procedure and service switch process have been saved the time; The present invention has simultaneously simplified time window model has been set.The focus of Frame time of reception scope is concentrated on the ToAWS, ignore ToAWE.The practical significance of this parameter that has been clear and definite has been simplified the setting of RNC to the time window parameter again; The present invention need not calibration process in the downlink data frame transmission course.Because through careful calculating and strict assessment, the setting of the transmitting time point of Frame and time of reception window all is rational in advance.Can occur Frame hardly and drop out phenomenon outside the time window.Therefore, improve the stability of Iub interface data frame transfer, saved the expense of calibration frame transmission.
Brief description of the drawings
Fig. 1 has described the flow chart of the processing method in the existing Iub FP agreement;
Fig. 2 is the schematic diagram of each time delay part in the time delay (Trnc) of RNC, shows the analysis simulation result of downlink data at the time delay point of RNC and Node B experience;
Fig. 3 illustrates the time series analysis simulation result of the downlink data non-jitter ground arrival Node B of Fig. 2;
When all reaching maximum, the shake of downlink data on any one time delay point that Fig. 4 illustrates Fig. 2 arrive the time series analysis simulation result of Node B;
Fig. 5 has described the time and the shake relation of the time window of downlink data and the Iub interface of Fig. 2;
Fig. 6 has described the flow chart of the method for the realization Iub interface transport channel synchronization in the embodiment of the invention;
Fig. 7 shows the detail flowchart of the method for the time window size ToAWS that calculates miscellaneous service in the step 30 of Fig. 6;
Fig. 8 shows the detail flowchart of definite method of the data transmitting time point that calculates RNC in the step 60 of Fig. 6.
Specific embodiment
According to the present invention, in conjunction with the actual needs of transport channel synchronization with at the defective of present scheme, the present invention proposes a kind of method of simple and stable, is that the reasonable value of time window proposes foundation, and be that the downlink data of RNC sends and proposes simply stable algorithm.
The present invention is divided into intrinsic time delay and shake with the transmission time on the Iub interface, depends on maximum delay shake on the Iub interface by the value that Iub interface transmission and processing delay, jitter analysis is drawn time window, proposes the data transmission method for uplink of RNC simultaneously.
At first introduce the several basic conceptions of using among the present invention:
1. time delay: refer to the pure processing time that Frame consumes on each processing unit of relevant device (RNC and Node B);
2. delay variation: refer to the stand-by period before the processing that Frame causes owing to reasons such as Frame queuing or treatment mechanisms on each processing unit of relevant device;
3. maximum delay shake: when referring to that Frame arrives each processing unit of relevant device, on the occasion of the peak-data amount, the maximum duration that wait for this moment.That is: Frame is managed the poor of the maximum delay of unit and minimal time delay throughout.
We are example with the speech business earlier, analyze the process of Frame in Iub interface transmission and processing.RNC is after receiving downlink data, and through the inter-process of RNC, process is transmitted on Iub interface then, and the processing through Node B sends to these frame data at last in the air.Real-time speech business is the situation that single cell can carry a complete FP frame.At this moment, the time delay that downlink data frame experienced is included in the time delay (Trnc) of RNC, and the time delay of Node B (Tnb), and Trnc and Tnb comprise each following Delay Factor respectively:
Fig. 2 is the schematic diagram of each time delay part in the time delay (Trnc) of RNC, shows the analysis simulation result of downlink data at the time delay point of RNC and Node B experience.Comprising, the intrinsic processing time Tri of RNC (RNC Intrinsic delay); The delay variation Trj of RNC (RNC delay Jitter).And each Delay Factor that Tnb comprises is: the intrinsic propagation delay time Tnb_ti of Node B side (Node BTransport Intrinsic delay); The propagation delay time shake Tnb_tj (Node BTranspott delay Jitter) of Node B side; Data are at the buffer time of Node B Tnb_buf; With data at the processing time of Node B Tproc.
Fig. 3 illustrates the time series analysis simulation result of the downlink data non-jitter ground arrival Node B of Fig. 2; Suppose frame data when experience RNC arrives Node B, before Node B handled, without any shake, establishing this time period was Ti=Tri+Tnb_t, that is: the shortest time of data experience each processing unit and transmission unit.At this moment, data arrive the maximum cushioning that Node B need carry out Node B, are buffered to LTOA and just begin the processing of Node B constantly.
When all reaching maximum, the shake of downlink data on any one time delay point that Fig. 4 illustrates Fig. 2 arrive the time series analysis simulation result of Node B; Suppose that frame data are when experience RNC arrives Node B, before NodeB handles, on any one time delay point, all experienced the maximum delay shake (Tmj=Trj+Tnb_tj) of this point, if the time of data experience this moment is: Tm=Ti+Tmj, that is: the maximum duration of data experience each processing unit and transmission unit.It should be noted that in this case data arrive Node B need be just directly aerial by sending to after the Node B processing through buffering (Tnb_buf).
As the above analysis, the shortest time that frame data of the real-time voice business of single cell arrive Node B is Ti, and maximum duration is Tm.Be dithered as Tmj=Tm-Ti.Therefore, the time of time window and Iub interface and shake relation are as follows, and the size of time window equals the delay variation of Iub interface: ToAWS=Tmj; The end point of time window and LTOA (Latest Time of Arrive, the time of advent point) the latest overlap, i.e. ToAWE=0.Fig. 5 has described the time and the shake relation of the time window of downlink data and the Iub interface of Fig. 2.
Generally, the time of the Node B that downlink data arrives is to have passed through fixed delay Ti, and some delay variations, arrive Node B after buffering Tnb_buf1 after a while (＜Tnb_buf), pass through processing time Tproc (the Time of Process of Node B then, processing time), send in the air and go.
By above-mentioned analysis, we as can be seen, because the processing time of each unit and delay variation all can obtain, therefore for the real time business of single cell, if RNC handles and sends downlink data constantly at the t1 shown in the figure four, total energy guarantees that Node B received downlink data before t3 is LTOA, after handling through Node B, in time data is sent in the air.This moment, process time calibration of Iub interface need not to carry out, and the adjustment data sending order of RNC also need not to carry out.The Business Stream of Iub interface is stable, and performance of services is protected at Iub interface.
Therefore, big or small ToAWS that can the definition time window is the maximum delay shake Tmj=Trj+Tnb_tj of Iub interface.
The value of above-mentioned realization window all is to suppose that RNC and the time delay of Node B and the value of shake are very accurate, and real time delay and shake are devious with the time delay and the shake that are obtained, estimate that the deviation of calculating is To (offset).Like this, the big or small computing formula of the time window of the real time business of for single cell is: ToAWS=Trj+Tnb_tj+To.
In addition, in above-mentioned analysis, all be to analyze at the business of single cell, and be carried on the business of many cells for the forms data frame, such as: the data service of 64k etc., may there be deviation between the time delay of the time delay of minimal data frame and maximum data frame, promptly there is propagation delay time shake (Tisj in professional between the Frame of professional different pieces of information amount of the same race, inside service jitter), to be such business be carried on the shake factor that the business of single cell has more than forms data frame to Tisj.Simultaneously, Tisj should calculate in the time window of this kind business, and promptly the computational methods of the time window of the business of many cells are: ToAWS=Trj+Tnb_tj+To+Tisj.Realize that at different equipment the computational methods of Tisj are with different.For the business of single cell, Tisj=0.
After the value of time window parameter is determined, the process of transmitting of the downlink data of RNC side is as follows: for the data of every frame arrival, RNC calculates moment t1 for this frame, and (t1 is the CFN point of frame data thus, vertical shift Frameoffset, fixed delay Ti, the processing time Tproc decision of maximum delay shake Tmj and Node B), judgment data arrives the time of RNC and the relation of t1 then, relation between the two is divided three kinds of situations: situation one, if downlink data arrived before t1, RNC begins data buffering to handle to send to t1 constantly, downlink data arrives Node B constantly as far back as t2, arrive Node B constantly at t3 the latest, generally, downlink data can be before t2 and t3 arrives such as moment of t4, Node B after receiving data, be buffered to LTOA constantly data are handled send to then aerial.Situation two, when if downlink data arrives RNC after t1, this moment, RNC should begin to handle and send this Frame immediately, these frame data might arrive Node B before LTOA, if can, in the processing of Node B with situation one, if after LTOA, arrive, this frame can only be dropped, because this frame has experienced too much delay in CN, can not aloft in time send.Situation three, downlink data arrived before t1, RNC also can begin to handle and send this frame data according to the buffer capacity of self before t1, can give this moment Node B increase compensator or trimmer pressure be RNC send the buffering at Node B (Tbuf_ra) that causes in advance, in this case, the big or small ToAWS=Trj+Tnb_tj+To+Tisj+Tbuf_ra of time window, promptly the size of time window depends on the maximum jitter of Iub interface RNC side, Iub interface Node B side maximum jitter Tnb_tj, the maximum at Node B that causes that sends in advance of RNC cushions in advance, the professional interior delay variation of miscellaneous service.
Because in the present invention, downlink data frame can not drop on outside the time window when arriving Node B, so the value of ToAWE is zero or approaching zero in the present invention.
Fig. 6 has described the flow chart of the method for the realization Iub interface transport channel synchronization in the embodiment of the invention.The flow process of the realization Iub interface transport channel synchronization that the present invention proposes is as follows:
At first in step 10, RAN system start-up begins to handle the flow process that realizes the Iub interface transport channel synchronization.
In step 20: miscellaneous service is in the reporting of processing delay jitter parameter and the reporting at the intrinsic time delay of Iub interface Node B side, processing time Tproc of Iub interface Node B side
When system start-up, the OM of Node B reports RNC with the processing delay and the jitter parameter empirical value of Node B side by the OM passage; Simultaneously, the OM of Node B reports RNC with intrinsic time delay, the processing time Tproc of Node B side by the OM passage.RNC can carry out the calculating of miscellaneous service time window and determining of RNC transmitting time point according to the parameter that NodeB reports.
In step 30: the time window size ToAWS of miscellaneous service determines:
At miscellaneous service, the shake of RNC and NodeB and buffering capacity value are determined the value of calculation deviation To, draw the value of big or small ToAWS of the time window of miscellaneous service then according to formula ToAWS=Trj+Tnb_tj+To+Tr_isj+Tnb_isj+Tbuf_ra.
In order to describe in the step 30 it is how to obtain these parameters thinlyyer, describe in detail referring now to Fig. 7.Fig. 7 shows the detail flowchart of the method for the time window size ToAWS that calculates miscellaneous service in the step 30 of Fig. 6.
Computing time, the size of window need be determined following several values:
In step 2.1, determine that miscellaneous service is at Iub interface RNC side maximum jitter Trj.Maximum delay that this single cell data frame that is dithered as corresponding service is experienced in Iub interface RNC side and minimal time delay poor.This parameter is one of factor of influence time window size.
In step 2.2, determine that miscellaneous service is at Iub interface Node B side maximum jitter Tnb_tj.Maximum delay that this single cell data frame that is dithered as corresponding service is experienced in Iub interface Node B side and minimal time delay poor.This parameter is one of factor of influence time window size.
In step 2.3, determine that the maximum at Node B that causes that sends in advance of RNC cushions Tbuf_ra in advance.This parameter is one of factor of influence time window size.
In step 2.4, determine miscellaneous service delay variation Tr_isj in the business of Iub interface RNC side.The maximum delay that maximum delay that this Frame that is dithered as the maximum of corresponding service is experienced in Iub interface RNC side and minimum data frame are experienced in Iub interface RNC side poor.This parameter is one of factor of influence time window size.
In step 2.5, determine miscellaneous service delay variation Tnb_isj in the business of Iub interface Node B side.The maximum delay that maximum delay that this Frame that is dithered as the maximum of corresponding service is experienced in Iub interface Node B side and minimum data frame are experienced in Iub interface Node B side poor.This parameter is one of factor of influence time window size.
By (these parameters are the realization parameter of RNC equipment and NodeB equipment) after equipment is realized analyzing the above-mentioned Several Parameters of acquisition, can obtain the required result of step 30.These steps of the present invention provide foundation for the value of miscellaneous service time window parameter, need not carry out the adjustment and the dynamic-configuration of time window in professional transmission course.
Refer again to Fig. 6, in step 40: it is synchronous that RNC and NodeB are carried out node
Synchronous by node, RNC can obtain up-downgoing propagation delay time, the round-trip delay between phase difference, RNC and the Node B between RFN and the BFN.
In step 50:, and select window parameter setup time for the transmission channel of setting up for the user sets up transmission channel
RNC selects suitable time window parameter, and transmission channel is carried out the configuration of time window parameter according to the type of service of setting up that transmission channel transmitted.
In step 60: the downlink data frame transmitting time point of determining RNC;
After corresponding transmission channel was set up, RNC was according to the time window parameter of type of service configuration corresponding transmission channels.After receiving downlink data frame, decide the transmitting time point of downlink data frame according to the processing time Tproc of the maximum delay shake Tmj of the fixed delay Ti of the skyborne transmitting time point of these frame data, Iub interface, Iub interface and Node B, definite needs of the data transmitting time point of RNC comprise following plurality of processes (referring to Fig. 8) thus.
In the step 5.1 of Fig. 8, determine that miscellaneous service is in the intrinsic time delay of Iub interface RNC side: for the business of many cells, this value is the fixed delay of this business minimum data frame correspondence; This parameter is for influencing one of factor of RNC down sending time point.
In step 5.2, determine that miscellaneous service is in the intrinsic time delay of Iub interface Node B side: for the business of many cells, this value is the fixed delay of this business minimum data frame correspondence; This parameter is for influencing one of factor of RNC down sending time point.
In step 5.3, determine the processing time Tproc of Node B; This parameter is for influencing one of factor of RNC down sending time point.
By equipment being realized analyzing acquisition above-mentioned Several Parameters (these parameters are the realization parameter of RNC equipment and NodeB equipment).
Value, maximum delay shake, the Frame of determining according to above-mentioned first three process will send the SFN when aerial, can draw the transmitting time point of the downlink data frame of RNC.
Definite method of the transmitting time point of the downlink data frame of the RNC that the present invention proposes does not need to carry out the initial synchronization of transmission channel, has saved the time of user's access thus.
Refer again to Fig. 6, begin to send the downlink business frame at step 70:RNC,
In professional transmission course, because reasonably time window parameter configuration and suitable R NC down sending time point, need not carry out the process of time calibration at Iub interface, the frame losing phenomenon can not take place.Therefore, according to the proposed method, Iub interface will provide reliable and stable business transmission for the user.
By the present invention, set up the analytical model of Iub interface data frame transfer and processing, thereby to RNC downlink data transmitting time point and Node B time of reception window size determine to provide rationally, foundation reliably; After the present invention proposes Node B initialization, report the method for all kinds of typical services Frames to RNC at the processing delay and the jitter parameter empirical value of Node B side by the OM passage; The present invention proposes RNC utilizes existing parameter that downlink data frame transmitting time point and Node B time of reception window are set and the technical scheme that need not dynamically adjust.
By embodiment of the present invention, insecure dynamic adjustment process in the existing protocol is converted to the process of a reliable static analysis and assessment.Realize analyzing and calculating by transmission and equipment to RNC and Node B, obtain intrinsic time delay and the maximum delay shake on Iub interface of RNC and Node B equipment, the value of time window is determined in shake according to maximum delay; RNC will send to the transmitting time point of definite corresponding data frame of processing time of aerial time point and Node B according to intrinsic time delay, maximum delay shake, data in addition.
With respect to the scheme of prior art, the scheme that proposes among the present invention has three tangible advantages:
1. saved transmission channel set up at the beginning of the long synchronizing process of Iub interface.Not only simplified the function design of RNC and Node B FP, the more important thing is, for user's access procedure and service switch process have been saved the time;
2. simplified time window model has been set.The focus of Frame time of reception scope is concentrated on the ToAWS, ignore ToAWE.The practical significance of this parameter that has been clear and definite has been simplified the setting of RNC to the time window parameter again;
3. need not calibration process in the downlink data frame transmission course.Because through careful calculating and strict assessment, the setting of the transmitting time point of Frame and time of reception window all is rational in advance.Can occur Frame hardly and drop out phenomenon outside the time window.Therefore, improve the stability of Iub interface data frame transfer, saved the expense of calibration frame transmission.
The realization of explanation invention has been described with specific embodiment for example.It is obvious should be understood that other variation of invention and each side thereof and revising those skilled in the art, and invention is not limited to described specific embodiment.Therefore, should consider to comprise the present invention and fall into true spirit and interior any/all modifications, variation or the equivalent transformation of basic principle scope disclosed and that require here.
Claims (10)
1, a kind of method that realizes the Iub interface transport channel synchronization of at least a business in communication system comprises step:
RNC obtains time delay and the delay variation parameter of described at least a business at Iub interface;
According to the delay variation parameter of described acquisition, calculate the time window of described business;
Set up transmission channel, for transmission channel is selected window parameter setup time;
According to the time delay and the delay variation parameter that obtain, calculate RNC transmitting time point;
According to the transmitting time point of downlink data frame, RNC sends the downlink business frame.
What 2, the method for claim 1, wherein described RNC obtained described at least a business comprises step in the time delay of Iub interface and the step of jitter parameter: obtain processing delay jitter parameter, intrinsic time delay, processing time Tproc parameter.
3, method as claimed in claim 2, comprising step: the OM of described Node B reports RNC with the processing delay and the jitter parameter empirical value of Node B side by the OM passage; The OM of Node B reports RNC with intrinsic time delay, the processing time Tproc of Node B side by the OM passage.
4, method as claimed in claim 2, the step of the time window of the described business of wherein said calculating also comprises step:
Determine the maximum jitter Trj of described business in Iub interface RNC side;
Determine that described business is at Iub interface Node B side maximum jitter Tnb_tj;
The maximum that Node B place causes that is sent in advance of determining RNC cushions Tbuf_ra in advance;
Determine described business delay variation Tr_isj in the business of Iub interface RNC side;
Determine described business delay variation Tnb_isj in the business of Iub interface Node B side;
Determine the value of calculation deviation To;
Obtain professional time window size ToAWS according to following formula,
ToAWS＝Tfj+Tnb_tj+To+Tr_isj+Tnb_isj+Tbuf_ra。
5, method as claimed in claim 4, wherein,
Described business is the poor of the maximum delay that experienced in Iub interface RNC side of single cell data frame of described business and minimal time delay at the maximum jitter Trj of Iub interface RNC side; And/or
Described business is the poor of the maximum delay that experienced in Iub interface Node B side of single cell data frame of described business and minimal time delay at Iub interface Node B side maximum jitter Tnb_tj; And/or
Described business delay variation Tr_isj in Iub interface RNC side professional maximum delay that to be the maximum delay that experienced in Iub interface RNC side of the Frame of the maximum of described business and minimum data frame experienced in Iub interface RNC side poor; And/or
Described business delay variation Tnb_isj in Iub interface Node B side professional maximum delay that to be the maximum delay that experienced in Iub interface Node B side of the Frame of the maximum of described business and minimum data frame experienced in Iub interface Node B side poor; And/or
The value of described calculation deviation To is to be determined by the error of calculation of time delay and jitter parameter.
6, the method for claim 1 also comprises step:
For the transmission channel of described foundation is selected window parameter setup time;
RNC selects suitable time window parameter, transmission channel is carried out the configuration of time window parameter according to the type of service of setting up that transmission channel transmitted.
7, the method for claim 1 also comprises step: the downlink data frame transmitting time point of determining RNC.
8, method as claimed in claim 7, wherein, the step of described definite time point is finished through the following steps: after receiving downlink data frame, determine the transmitting time point of downlink data frame according to the processing time Tproc of the maximum delay shake Tmj of the intrinsic time delay Ti of the skyborne transmitting time point of these frame data, Iub interface, Iub interface and Node B.
9, method as claimed in claim 8, wherein, the intrinsic time delay Ti of described Iub interface comprises the intrinsic time delay and the intrinsic time delay of Node B side of RNC side;
Described business is the fixed delay of this business minimum data frame correspondence in the intrinsic time delay of Iub interface RNC side;
Described business is the fixed delay of this business minimum data frame correspondence in the intrinsic time delay of Iub interface Node B side.
10, a kind of device of realizing the Iub interface transport channel synchronization of at least a business in communication system comprises:
Obtain the device of time delay and jitter parameter, be used to obtain time delay and the delay variation parameter of described at least a business at Iub interface;
Time window is determined device, is used for the delay variation parameter according to described acquisition, calculates the time window of described business;
Set up transmission channel, for transmission channel is selected window parameter devices setup time;
RNC transmitting time point is determined device, is used for time delay and delay variation parameter according to described acquisition, calculates RNC transmitting time point;
Dispensing device is used for sending the downlink business frame according to the transmitting time point of downlink data frame.
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